Boersma, Foekje. <br/><br/>
Conservation ;   Vol. 22, no. 1 

 - Los Angeles-XXUZ:  :   Getty Conservation Intitute,   2007. 
 - p. 22-25 :   il. 
 - Cuatrimestral 
 - Vol. 22, no 1(2007).  
 - Conservation ;   Vol. 22, no. 1 .
 - Getty Conservation Intitute. .